The covariant constituent quark model by Ramalho and Peña [1]}, [2]} provides a description with a dominant \(G_M\)  form factor for the \(\Delta (1232)\rightarrow N\gamma ^*\)  transition while the other two form factors come out to be small, in accordance with data obtained in the space like region.
The eTFF is build from two contributions originating form the quark core and the pion cloud.
The quark core component describes the resonance as a quark-diquark system in \(S\) -wave with a small admixture (\(1\%\) ) of a \(D\)  state.
This contribution is determined from lattice QCD and also in agreement with the data in the space-like region at high \(q^2\) .
The comparison with time-like data visualizes the role of the meson cloud component which is dominantly of pionic type.
The contribution of the pion cloud in the time-like region is parameterized using two terms: a photon, either directly coupling to a pion or to an intermediate baryon states.
The eTFF of the pion is fixed from available data.
In their most recent work [2]}, in contrast to previous implementations [4]}, [1]} based on the Iachello-Wann model developed for the nucleon eTFF [6]}, [7]}, the correct position of the meson pole and the width has been included.
A similar model has been applied for the \(N^*(1520)\)  resonance [8]}.
The striking feature of both calculations is an important and increasing role of the pion cloud contribution in the time-like region.
